Joe Brown's voice sounds something akin to the jazzy and brash Darin's in the title song. Have you ever seen a production? The book of it, while somewhat based on a Cinderella theme, is kind of original. Darin died too young and never did a musical. Btw, if you ever get a chance to see his Oscar-nominated performance in "Captain Newman, MD", it's one of the greatest acting performances of a character with post-traumatic stress disorder captured on film. He could certainly act as well as sing. He was probably too in demand to do a Broadway musical in the 60s. Has "Charlie Girl" had any major productions in the US?